Is it true that the different mechanism through which crystal fractionation occurs are crystal settling,filter pressing,inward crystalization,and flow segregation?
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Answer:
Soon after geologists began doing chemical analyses of igneous rocks they realized that rocks emplaced in any given restricted area during a short amount of geologic time were likely related to the same magmatic event. Evidence for some kind of relationship between the rocks, and therefore between the magmas that cooled to form the rocks came from plotting variation diagrams.
A variation diagram is a plot showing how each oxide component in a rock varies with some other oxide component. Because SiO2 usually shows the most variation in any given suite of rocks, most variation diagrams plot the other oxides against SiO2 as shown in the diagram here, although any other oxide could be chosen for plotting on the x-axis. Plots that show relatively smooth trends of variation of the components suggested that the rocks might be related to one another through some process. Of course, in order for the magmas to be related to one another, they must also have been intruded or erupted within a reasonable range of time. Plotting rocks of Precambrian age along with those of Tertiary age may show smooth variation, but it is unlikely that the magmas were related to one another.
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